Wifi Diagnostics Tool

I'm looking for tool suggestions. I find myself doing a lot more wifi troubleshooting than we have in the past and I'm looking for a tool to make it easier. I'd like something handheld (I've looked at the Fluke Aircheck, but it's pricey and doesn't seem complete). I'm looking for more than just a simple wifi stumbler. In most locations I know where the APs are, I'd acutally like to see channel usage/interference and some testing would be great.

Is there a PC based software that I could install on a small laptop, any favorites?

Does anyone know of any alteratives to Fluke Aircheck?

I know iOS limits this, but are there any good Android apps for this purpose?

If you really want to troubleshoot, you need more than just something that shows APs, their channels, etc.. You actually need a spectrum analyzer that will show you everything happening on a frequency band. Often, Wi-fi problems are caused by noise generated by non-wi-fi devices of all kinds. Remember that these are "open" frequencies that can be used by all sorts of devices. Are you interested in dual-band (2.4ghz and 5ghz) or just 2.4ghz? Fluke AirCheck is pricey ($2,000), but is good. But you'd have to do a lot of troubleshooting to get any kind of ROI on it. However, you can start out with a software/hardware combination that is much less expensive for spectrum analysis on these bands. Here is a place to start:

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